Sanding pad



March 1s, 1947.

Mtr-NESS.

A. G. DECKER 2,417,680

SANDING YAD Original Filed Dec. 31, 1941 L Q/v'zo DECKER Patented Mar. 18, 1947 SANDING PAD Alonzov G. Decker, Baltimore signor to The Black and Decker Manufacturing Company', a` corporation of Maryland` original application December 3:1, i941, serial No.

425,181, now'Patent No. 2 19411. Divided and this 4 Claims. 1

This application is a division of copending application 425,181, filed. December 31, 1941, which has since matured into Patent No. 2,350,098, May 30, 1944. The invention relates to sanding pads for use with a reciprocating sander head which is part of a manually supported and directed power driven tool, more particularly, an electric tool though lother power sources may be employed.

The pad of the invention supports a small piece of sand paper or emery cloth or other abrasive surface, giving the effect of. an abrasive sheet pressed by two ngers against the parts which are being sanded. and moved back and forthV by oscillation of the lingers. To this extent the operation simulates the hand-sanding operation.

Figures l and 2 are vertical sectional viewsV of sanding pads of this invention and of their mountings.

As already pointed out the sander heads of the invention are particularly adapted to the performance of sanding operations where rotary Sanders cannot be used, as in` grooves and corners and other conned areas and elsewhere under circumstances in whichsheets of abrasive material have previously been applied by the pressure of one or more ngers of the hand' which ngers are moved with a reciprocating or rubbing motion.

Referring to Figs. 1 and 2', the pad inthe form here shown is of the rectangular shape, elongated transversely to the length of the armJ of the sander and to the corresponding radius. of the sander shaft though this precise form and size are unimportant except that all the pads used with the machines disclosed in the parent application are preferably of the small size indicated, providing for the use of a small motor to drive them, which motor is suitable to the one hand-control unit disclosed, the pads likewise being suitable to the operation described. These modications are like those shown in Figs. 18 and 19 of the parent application.

Figs. 1 and 2 show forms of pad and pad-supports particularly adapted for use with the construction, Figs, l, 9 and l2, of the parent application, being preferably rectangular Fig. 1, for example, shows the shank 200 depending from the follower member as per Fig. 1 of the parent application. This shank is threaded at 20| to engage a lock nut 203 and internally threaded at 204 to receive a flat headed screw 205. The pad proper 206 is apertured at the center to pass over the screw-threaded shank 200.

`,350',098, dated May 30, application Aprilr 2'8,

In assembling the pad on the shank 200, the nut 203 is rst turned up slightly above the position shown the drawing,u plate or washer 201 is then passed up over the shank into contact with the nut, the pad 206 is then engaged with the shank and passed upwardly against the washer and the screw 2th is inserted and turned upwardly to a position shown to support the pad, the head of the same engaging the bottom of the pad. An. abrasive sheet 208 is then placed in position to cover the bottom of the pad and the ends oi the sheet at 209 are turned upwardly over the ends of the pad and over the top of the pad, after which the Washer 201 having been previously raisedto admit the ends 209 of the abrasive sheet is forced downwardly against said pad by turning nut 203 downwardly whereby said ends 209 are clamped and the abrasive sheet is, secured in. position and is thus made ready for any of` the sanding` operations mentioned, the pad likewise being suitably clamped.

In theconstruction, Fig. 2, the depending shank 2|0 of the follower is made of reduced: cross-section and preferably solid', being externally threaded as shown. In this construction the pad 206 is mounted on` a sleeve 2 H which is part of the pad member and is externally and also internally threaded andV preferably hanged at its lower end at. 2|2. to support the pad. This sleeve carries threaded thereon above the pad, a lock nut or pressure nut 203and1 a washer 201as described above in connection with Fig. 1, and beneath the washer there may be a flexiblebacking 2 I4. The pads, in al1v instances, may be of felt or rubber sponge,` or the like.l y

In this instance the. abrasive sheet2 I 5 is placed inY registrationwith the bottom surface of the pad, completely covering the same as inthe previousl instance, i. e. in Fig. 1, andA the ends 2l6v of the sheet are passed upwardly over the ends of the pad, and then folded over the top of the same between the top surface of the pad and said plate 2M. To clamp the ends of the pad to hold the latter in operative position, the nut 203 is screwed down against the washer 201 and thus applies pressure to the plate 2 I4 clamping the ends of the abrasive sheet in position and holding the latter in its operative relation to the pad. If desired, the exible plate or sheet 284 may be omitted, the washer 201, in most instances, being of a diameter approaching or equal to the transverse dimension of the pad so that it is suilicient to hold the ends of the sheet when pressed down by the nut 203.

I have thus described the invention in two dif- 3 ferent forms, the description being specific and in detail in order that the manner of constructing, applying, operating and using the invention may be fully understood, however, the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being dened in the claims.

What I claim as new and desire to secure by Letters Patent is:

1. A resilient sanding pad member for a rotary abrading tool comprising a relatively large approximately rectangular resiliently flexing pad having a central aperture, a screw threaded shank extending through said aperture relatively small transversely extending means operatively connected to said shank for supporting the pad from beneath, said means being sunk into said aperture to present a plane surface on the underside of the pad, a relatively small centrally apertured plate located on top of said pad with the shank extending through said aperture, a nut threaded on said shank and located above the plate, said relatively small transversely extending means and plate allowing the flexing of the major part of said pad.

2. A resilient sanding pad member for a rotary abrading tool comprising a relatively large approximately rectangular resiliently exing pad having a central aperture, a screw threaded shank extending through said aperture, relatively small transversely extending means operative- 1y connected to said shank for supporting the pad from beneath, said means being sunk into said aperture to present a plane surface on the underside of the pad, a relatively small centrally apertured plate located on top of said pad with the shank extending above the plate, a nut threaded on said shank, and an abrasive sheet covering the bottom of said pad and having opposite end edge portions adapted to be folded over corresponding end edges of the pad and inserted between said plate and the top of the pad, the tightening of the nut against the plate serving to clamp the abrasive sheet in the position described, said relatively small transversely extending means and plate allowing the ilexing of the major part of said pad.

`3. A resilient sanding pad member for a rotary abrading tool comprising a relatively large approximately rectangular resiliently flexing pad having a central aperture, a screw threaded sectioned shank extending through said aperture and having a relatively small flange for supporting the pad from beneath, on the lower section thereof, said flange being sunk into said aperture to present a plane surface on the underside of the pad, a relatively small centrally apertured plate located on top of said pad with the shank extending through said aperture, a nut threaded on the shank and located above the plate, and

an abrasive sheet covering the bottom of said pad and said flange and having opposite end edge portions adapted to be folded over corresponding end edges of the pad and inserted between said plate and the top of the pad, the tightening of the nut against the pad serving to clamp the abrasive sheet in the position described, said supporting flange being engaged with the lower end of said shank, which is also adapted for operative engagement with a sanding machine drive, said relatively small flange and plate allowing the flexing of the major part of said pad.

4. A resilient sanding pad member for a rotary abrading tool comprising a relatively large approximately rectangular resiliently flexing pad having a central aperture, a screw threaded shank extending through said aperture and having relatively small means for supporting the pad from beneath, said means being sunk into said aperture to present a plane surface on the underside of the pad, a relatively small centrally apertured plate located on top of said pad with the shank extending through said aperture, a nut threaded on the shank and located above the plate and an abrasive sheet covering the bottom of said pad and said means and having opposite end edge portions adapted to be folded over corresponding end edges of the pad and inserted between said plate and the top of the pad, the tightening of the nut against the plate serving to clamp the abrasive sheet in the position described, said shank being hollow and having a screw threaded upwardly into said hollow, said latter screw having a head which acts as said pad-supporting means, said relatively small pad supporting means and plate allowing the flexing of the major part of said pad.

ALONZO G. DECKER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 577,860 Keighley Mar. 2, 1897 736,289 Murray Aug. 11, 1903 914,378 Barz Mar. 9, 1909 1,067,280 Smilovetz July 15, 1913 1,501,192 Severns July 15, 1924 2,036,107 Thomas Mar. 31, 1936 1,520,642 Giro-ux Dec. 23, 1924 1,562,415 Newman Nov. 17, 1925 FOREIGN PATENTS Number Country Date 287,642 British Mar. 26, 1928 582,349 German Aug. 14, 1933 

